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Three known dyes were synthesized and their UV\u2010vis absorbance spectra were measured in a range of solvent using the two bases and the zwitterionic forms of the dyes. It was found that the methanolic tetrabutylammonium hydroxide could cause the appearance of inverted solvatochromism in negatively solvatochromic dyes when used in solvents of sufficiently low polarity. This was attributed to the presence of the polar, hydrogen bond donating methanol which preferentially solvates the dye, increasing the polarity it observes. Informed by these results, recommendations are presented for the methods used to compare solvatochromic dyes.<\/jats:p>","DOI":"10.1002\/chem.202404678","type":"journal-article","created":{"date-parts":[[2025,2,21]],"date-time":"2025-02-21T10:15:07Z","timestamp":1740132907000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Base\u2010Induced Apparent Inverted Solvatochromism in Pyridinium Phenolates"],"prefix":"10.1002","volume":"31","author":[{"given":"Stephen","family":"Franzese","sequence":"first","affiliation":[{"name":"ARC Centre of Excellence in Exciton Science School of Chemistry University of Melbourne  Parkville Victoria 3010 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chaoyu","family":"Ren","sequence":"additional","affiliation":[{"name":"ARC Centre of Excellence in Exciton Science School of Chemistry University of Melbourne  Parkville Victoria 3010 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7131-8532","authenticated-orcid":false,"given":"Wallace W. 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